5. Now reload the incident record and scroll down to related list 'Incident Tasks'.6. There won't be 'New' button available7. Reload the same record in the workspace and there you could see 'New' button under related list 'Incident Tasks'.

Expected behavior: As per the list control configuration, the 'New' button shouldn't be available in the workspace.

Workaround

This is expected behaviour as Workspace lists do not support the list control.